Add placeholder variable name in generated code

demo/rust/src/interface.rs

@@ -506,7 +506,7 @@ pub trait FibonacciListTrait {
         false
     }
     fn fetch_more(&mut self) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn fibonacci_number(&self, index: usize) -> u64;
     fn row(&self, index: usize) -> u64;
 }
@@ -694,12 +694,12 @@ pub trait FileSystemTreeTrait {
     fn emit(&mut self) -> &mut FileSystemTreeEmitter;
     fn path(&self) -> Option<&str>;
     fn set_path(&mut self, value: Option<String>);
-    fn row_count(&self, Option<usize>) -> usize;
+    fn row_count(&self, _: Option<usize>) -> usize;
-    fn can_fetch_more(&self, Option<usize>) -> bool {
+    fn can_fetch_more(&self, _: Option<usize>) -> bool {
         false
     }
-    fn fetch_more(&mut self, Option<usize>) {}
+    fn fetch_more(&mut self, _: Option<usize>) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn check_row(&self, index: usize, row: usize) -> Option<usize>;
     fn index(&self, item: Option<usize>, row: usize) -> usize;
     fn parent(&self, index: usize) -> Option<usize>;
@@ -1001,12 +1001,12 @@ pub trait ProcessesTrait {
     fn emit(&mut self) -> &mut ProcessesEmitter;
     fn active(&self) -> bool;
     fn set_active(&mut self, value: bool);
-    fn row_count(&self, Option<usize>) -> usize;
+    fn row_count(&self, _: Option<usize>) -> usize;
-    fn can_fetch_more(&self, Option<usize>) -> bool {
+    fn can_fetch_more(&self, _: Option<usize>) -> bool {
         false
     }
-    fn fetch_more(&mut self, Option<usize>) {}
+    fn fetch_more(&mut self, _: Option<usize>) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn check_row(&self, index: usize, row: usize) -> Option<usize>;
     fn index(&self, item: Option<usize>, row: usize) -> usize;
     fn parent(&self, index: usize) -> Option<usize>;
@@ -1286,7 +1286,7 @@ pub trait TimeSeriesTrait {
         false
     }
     fn fetch_more(&mut self) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn cos(&self, index: usize) -> f32;
     fn set_cos(&mut self, index: usize, f32) -> bool;
     fn sin(&self, index: usize) -> f32;

src/rust.rs

@@ -597,14 +597,14 @@ pub trait {}Trait {{
                     } else {
                         writeln!(
                             r,
-                            "    fn set_{}(&mut self, index: usize, &[u8]) -> bool;",
+                            "    fn set_{}(&mut self, index: usize, _: &[u8]) -> bool;",
                             name
                         )?;
                     }
                 } else {
                     writeln!(
                         r,
-                        "    fn set_{}(&mut self, index: usize, {}) -> bool;",
+                        "    fn set_{}(&mut self, index: usize, _: {}) -> bool;",
                         name,
                         rust_type_(ip)
                     )?;

tests/rust_list/src/interface.rs

@@ -185,11 +185,11 @@ pub trait NoRoleTrait {
         false
     }
     fn fetch_more(&mut self) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn user_age(&self, index: usize) -> u8;
-    fn set_user_age(&mut self, index: usize, u8) -> bool;
+    fn set_user_age(&mut self, index: usize, _: u8) -> bool;
     fn user_name(&self, index: usize) -> &str;
-    fn set_user_name(&mut self, index: usize, String) -> bool;
+    fn set_user_name(&mut self, index: usize, _: String) -> bool;
 }
 
 #[no_mangle]
@@ -397,9 +397,9 @@ pub trait PersonsTrait {
         false
     }
     fn fetch_more(&mut self) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn user_name(&self, index: usize) -> &str;
-    fn set_user_name(&mut self, index: usize, String) -> bool;
+    fn set_user_name(&mut self, index: usize, _: String) -> bool;
 }
 
 #[no_mangle]

tests/rust_list_types/src/interface.rs

@@ -188,39 +188,39 @@ pub trait ListTrait {
         false
     }
     fn fetch_more(&mut self) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn boolean(&self, index: usize) -> bool;
-    fn set_boolean(&mut self, index: usize, bool) -> bool;
+    fn set_boolean(&mut self, index: usize, _: bool) -> bool;
     fn bytearray(&self, index: usize) -> &[u8];
-    fn set_bytearray(&mut self, index: usize, &[u8]) -> bool;
+    fn set_bytearray(&mut self, index: usize, _: &[u8]) -> bool;
     fn f32(&self, index: usize) -> f32;
-    fn set_f32(&mut self, index: usize, f32) -> bool;
+    fn set_f32(&mut self, index: usize, _: f32) -> bool;
     fn f64(&self, index: usize) -> f64;
-    fn set_f64(&mut self, index: usize, f64) -> bool;
+    fn set_f64(&mut self, index: usize, _: f64) -> bool;
     fn i16(&self, index: usize) -> i16;
-    fn set_i16(&mut self, index: usize, i16) -> bool;
+    fn set_i16(&mut self, index: usize, _: i16) -> bool;
     fn i32(&self, index: usize) -> i32;
-    fn set_i32(&mut self, index: usize, i32) -> bool;
+    fn set_i32(&mut self, index: usize, _: i32) -> bool;
     fn i64(&self, index: usize) -> i64;
-    fn set_i64(&mut self, index: usize, i64) -> bool;
+    fn set_i64(&mut self, index: usize, _: i64) -> bool;
     fn i8(&self, index: usize) -> i8;
-    fn set_i8(&mut self, index: usize, i8) -> bool;
+    fn set_i8(&mut self, index: usize, _: i8) -> bool;
     fn optional_boolean(&self, index: usize) -> Option<bool>;
-    fn set_optional_boolean(&mut self, index: usize, Option<bool>) -> bool;
+    fn set_optional_boolean(&mut self, index: usize, _: Option<bool>) -> bool;
     fn optional_bytearray(&self, index: usize) -> Option<&[u8]>;
-    fn set_optional_bytearray(&mut self, index: usize, Option<&[u8]>) -> bool;
+    fn set_optional_bytearray(&mut self, index: usize, _: Option<&[u8]>) -> bool;
     fn optional_string(&self, index: usize) -> Option<&str>;
-    fn set_optional_string(&mut self, index: usize, Option<String>) -> bool;
+    fn set_optional_string(&mut self, index: usize, _: Option<String>) -> bool;
     fn string(&self, index: usize) -> &str;
-    fn set_string(&mut self, index: usize, String) -> bool;
+    fn set_string(&mut self, index: usize, _: String) -> bool;
     fn u16(&self, index: usize) -> u16;
-    fn set_u16(&mut self, index: usize, u16) -> bool;
+    fn set_u16(&mut self, index: usize, _: u16) -> bool;
     fn u32(&self, index: usize) -> u32;
-    fn set_u32(&mut self, index: usize, u32) -> bool;
+    fn set_u32(&mut self, index: usize, _: u32) -> bool;
     fn u64(&self, index: usize) -> u64;
-    fn set_u64(&mut self, index: usize, u64) -> bool;
+    fn set_u64(&mut self, index: usize, _: u64) -> bool;
     fn u8(&self, index: usize) -> u8;
-    fn set_u8(&mut self, index: usize, u8) -> bool;
+    fn set_u8(&mut self, index: usize, _: u8) -> bool;
 }
 
 #[no_mangle]

tests/rust_tree/src/interface.rs

@@ -178,18 +178,18 @@ impl PersonsTree {
 pub trait PersonsTrait {
     fn new(emit: PersonsEmitter, model: PersonsTree) -> Self;
     fn emit(&mut self) -> &mut PersonsEmitter;
-    fn row_count(&self, Option<usize>) -> usize;
+    fn row_count(&self, _: Option<usize>) -> usize;
-    fn can_fetch_more(&self, Option<usize>) -> bool {
+    fn can_fetch_more(&self, _: Option<usize>) -> bool {
         false
     }
-    fn fetch_more(&mut self, Option<usize>) {}
+    fn fetch_more(&mut self, _: Option<usize>) {}
-    fn sort(&mut self, u8, SortOrder) {}
+    fn sort(&mut self, _: u8, _: SortOrder) {}
     fn check_row(&self, index: usize, row: usize) -> Option<usize>;
     fn index(&self, item: Option<usize>, row: usize) -> usize;
     fn parent(&self, index: usize) -> Option<usize>;
     fn row(&self, index: usize) -> usize;
     fn user_name(&self, index: usize) -> &str;
-    fn set_user_name(&mut self, index: usize, String) -> bool;
+    fn set_user_name(&mut self, index: usize, _: String) -> bool;
 }
 
 #[no_mangle]